linux-kernel - [PATCH] drm/bridge: lontium-lt8912b: Do not generate HFP

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <20250728150059.2642055-1-max.oss.09@gmail.com>
Date: Mon, 28 Jul 2025 17:00:50 +0200
From: max.oss.09@...il.com
To: Max Krummenacher <max.krummenacher@...adex.com>
Cc: Adrien Grassein <adrien.grassein@...il.com>,
	Andrzej Hajda <andrzej.hajda@...el.com>,
	David Airlie <airlied@...il.com>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Jonas Karlman <jonas@...boo.se>,
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Robert Foss <rfoss@...nel.org>,
	Simona Vetter <simona@...ll.ch>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] drm/bridge: lontium-lt8912b: Do not generate HFP

From: Max Krummenacher <max.krummenacher@...adex.com>

The datasheet of lontium-lt8912b doesn't require blanking during
the HFP period. Thus use LP during HFP.

Tested with a samsung-dsim (i.MX8 MM) and a tc358768 DPI to DSI bridge
as the DSI host.

Signed-off-by: Max Krummenacher <max.krummenacher@...adex.com>

---

 drivers/gpu/drm/bridge/lontium-lt8912b.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/bridge/lontium-lt8912b.c b/drivers/gpu/drm/bridge/lontium-lt8912b.c
index 3e49d855b364..760d89493276 100644
--- a/drivers/gpu/drm/bridge/lontium-lt8912b.c
+++ b/drivers/gpu/drm/bridge/lontium-lt8912b.c
@@ -494,6 +494,7 @@ static int lt8912_attach_dsi(struct lt8912 *lt)
 
 	dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
 			  MIPI_DSI_MODE_LPM |
+			  MIPI_DSI_MODE_VIDEO_NO_HFP |
 			  MIPI_DSI_MODE_NO_EOT_PACKET;
 
 	ret = devm_mipi_dsi_attach(dev, dsi);
-- 
2.42.0